Light intensity difference sensing device, wearable device and display screen brightness adjusting method

Abstract

Embodiments of the present application disclose a light intensity difference sensing device, a wearable device and a display screen brightness adjusting method. The light intensity difference sensing device comprises a support structure, an ASIC chip and first and second sensing members. The support structure is provided with a light passage. The ASIC chip is arranged on the support structure. The first and second sensing members are respectively arranged on opposite sides of the ASIC chip, and the second sensing member is located in the light passage. The first sensing member is used for receiving ambient light of an environment in which the light intensity difference sensing device is located and generating a first photoelectric signal to obtain an external light intensity measurement value. The second sensing member is used for receiving imaging light emitted by a display screen and generating a second photoelectric signal to obtain an internal light intensity measurement value. The ASIC chip is used for obtaining a light intensity difference value according to a difference between the external light intensity measurement value and the internal light intensity measurement value.

Description

Technical Field

[0001] This application belongs to the field of electronic equipment technology, specifically relating to a light intensity difference sensing device, a wearable device, and a method for adjusting the brightness of a display screen. Background Technology

[0002] With the rapid development of display technology and integrated circuits, immersive experience devices, as a type of wearable device, are gradually entering people's lives. Immersive experience devices include various forms of smart glasses and smart helmets.

[0003] Currently, wearable devices with immersive experience features are becoming increasingly popular. In pursuit of an immersive visual experience, wearable devices have proposed many solutions to prevent light leakage. However, while these technologies prevent light leakage, they often lead to a greater difference in light intensity between the external environment and the wearable device itself. If a user suddenly removes the wearable device, their eyes may not be able to adapt to the ambient light, which can cause eye damage. Summary of the Invention

[0004] This application aims to provide a light intensity difference sensing device, a wearable device, and a display brightness adjustment method. When a user removes the wearable device, the user's eyes can gradually adapt to the light intensity difference between the inside and outside of the wearable device, which can effectively avoid damage to the user's eyes caused by a sudden increase in light intensity, thereby effectively preventing glare.

[0005] In a first aspect, embodiments of this application provide a light intensity difference sensing device. The light intensity difference sensing device includes:

[0006] A support structure, wherein a light transmission channel is provided on the support structure;

[0007] An ASIC chip, wherein the ASIC chip is disposed on the support structure;

[0008] A first sensing element and a second sensing element are respectively disposed on opposite sides of the ASIC chip, and the second sensing element is located within the light transmission channel;

[0009] Wherein, the first sensing element is used to receive the ambient light of the environment in which the light intensity difference sensing device is located and generate a first photoelectric signal to obtain an external light intensity measurement value; the second sensing element is used to receive the imaging light emitted by the display screen and generate a second photoelectric signal to obtain an internal light intensity measurement value; the ASIC chip is used to obtain a light intensity difference value based on the difference between the external light intensity measurement value and the internal light intensity measurement value.

[0010] Secondly, embodiments of this application provide a wearable device. The wearable device includes: a housing, a display screen, and a light intensity difference sensing device as described in the first aspect, wherein the display screen and the light intensity difference sensing device are disposed within the housing.

[0011] Thirdly, embodiments of this application provide a method for adjusting the brightness of a display screen, applied to a wearable device as described in the second aspect; the method includes:

[0012] The light intensity difference is obtained, which is the difference between the external light intensity measurement value and the internal light intensity measurement value; wherein, the external light intensity measurement value is the ambient light brightness value of the environment in which the wearable device is located, and the internal light intensity measurement value is the luminous brightness value of the display screen of the wearable device;

[0013] Based on the light intensity difference, the brightness of the display screen is adjusted to the ambient light brightness value or the target brightness value.

[0014] In the embodiments of this application, a light intensity difference sensing device is provided, which is applicable to wearable devices with immersive experience functions, such as smart glasses or smart helmets. It can adjust the brightness of the display screen inside the wearable device directly according to the ambient light conditions. When the user removes the wearable device, the user's eyes can gradually adapt to the light intensity difference between the inside and outside of the wearable device, which can effectively avoid damage to the user's eyes caused by a sudden increase in light intensity, thereby effectively preventing glare. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a light intensity difference sensing device provided according to some embodiments of this application;

[0016] Figure 2 This is a schematic diagram of the structure of a light intensity difference sensing device provided according to some embodiments of this application;

[0017] Figure 3 This is a flowchart of a display screen brightness adjustment method provided according to some embodiments of this application;

[0018] Figure 4 This is a flowchart of a display screen brightness adjustment method provided according to some embodiments of this application;

[0019] Figure 5 This is a schematic diagram of a display screen brightness adjustment method provided according to some embodiments of this application.

[0020] Figure label:

[0021] 101. Electrical connection wire; 102. Carrier board; 103. Solder pad; 104. First through-hole; 105. Motherboard; 106. Transparent material; 107. Second sensor; 108. ASIC chip; 109. Through-silicon via; 110. Thermally conductive and light-shielding layer; 111. First sensor; 112. Opaque encapsulation layer; 01. Ambient light; 02. Imaging light. Detailed Implementation

[0022] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0024] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] The light intensity difference sensing device, wearable device, and display brightness adjustment method provided according to embodiments of this application are further described below with reference to the accompanying drawings.

[0027] The light intensity difference sensing device provided in this application embodiment can be applied to wearable devices, such as VR glasses, VR helmets, AR glasses and AR helmets, and other products with immersive experience functions.

[0028] According to one embodiment of this application, a light intensity difference sensing device is provided. See also Figure 1 and Figure 2 The light intensity difference sensing device includes a support structure, an ASIC chip 108, a first sensing element 111, and a second sensing element 107. A light transmission channel is provided on the support structure. The ASIC chip 108 is disposed on the support structure. The first sensing element 111 and the second sensing element 107 are respectively disposed on opposite sides of the ASIC chip 108, and the second sensing element 107 is located within the light transmission channel. The first sensing element 111 is used to receive ambient light O1 from the environment where the light intensity difference sensing device is located and generate a first photoelectric signal to obtain the external light intensity measurement value A. o The second sensing element 107 is used to receive the imaging light 02 emitted by the display screen and generate a second photoelectric signal to obtain the internal light intensity measurement value A. i The ASIC chip 108 is used to measure the external light intensity value A. o and the internal light intensity measurement value A i The difference is used to obtain the light intensity difference δ.

[0029] The light intensity difference sensing device described in the above embodiments of this application is a device for detecting light intensity difference. The first sensing element 111 and the second sensing element 107 are, for example, photodiodes, capable of receiving light and generating photoelectric signals. The entire light intensity difference sensing device features a simple structural design, high detection accuracy, stronger resistance to temperature drift, and a wider dynamic range.

[0030] The light intensity difference sensing device provided in this application embodiment can be applied to immersive experience devices, such as VR glasses, VR helmets, AR glasses, and VR helmets, which belong to wearable devices.

[0031] This application uses VR glasses as an example. Using the light intensity difference sensing device provided in the above embodiments, the light intensity difference δ between the inside and outside of the VR glasses can be obtained. Specifically, the external light intensity measurement value A of the VR glasses... o That is, the light intensity detected by the first sensing element 111, and the internal light intensity measurement value A of the VR glasses. iThis refers to the light intensity detected by the second sensing element 107. The first sensing element 111 is, for example, a first photodiode, and the second sensing element 107 is, for example, a second photodiode.

[0032] For example, the external light intensity measurement value A of the VR glasses o The internal light intensity measurement value A of the VR glasses is 1500 lx. i If the light intensity is 800 lx, then the light intensity difference δ between the inside and outside of the VR glasses is 700 lx. This example shows that the external light intensity of the VR glasses is greater than the internal light intensity, and the light intensity difference δ between the two is large.

[0033] For example, the external light intensity measurement value A of the VR glasses o The internal light intensity measurement value A of the VR glasses is 10000 lx. i If the light intensity is 1000 lx, then the light intensity difference δ between the inside and outside of the VR glasses is 9000 lx. This example shows that the external light intensity of the VR glasses is greater than the internal light intensity of the VR glasses, and the light intensity difference δ is extremely large.

[0034] For example, the external light intensity measurement value A of the VR glasses o The internal light intensity measurement value A of the VR glasses is 300 lx. i If the light intensity is 600 lx, then the light intensity difference δ between the inside and outside of the VR glasses is -300 lx. This example shows that the external light intensity of the VR glasses is less than the internal light intensity of the VR glasses, and the light intensity difference δ is relatively large.

[0035] For example, the external light intensity measurement value A of the VR glasses o The internal light intensity measurement value A of the VR glasses is 0x. i If the light intensity is 1000 lx, then the light intensity difference δ between the inside and outside of the VR glasses is -1000 lx. This example shows that the external light intensity of the VR glasses is less than the internal light intensity of the VR glasses, and the light intensity difference δ is extremely large.

[0036] Since light from inside or outside the VR glasses can be transmitted to the light intensity difference sensing device through light guiding schemes such as optical fibers or light guide pillars, the light intensity difference sensing device can be located anywhere in the VR glasses, meaning that the placement of the light intensity difference sensing device in the VR glasses is quite flexible.

[0037] For example, the ambient light outside the VR glasses, i.e., the ambient light 01 outside the light intensity difference sensing device, can be transmitted to the first sensing element 111 through the opening on the outer surface of the VR glasses and the first light guide structure; the imaging light 02 of the display screen inside the VR glasses is transmitted to the second sensing element 107 through the opening near the display screen and the second light guide structure. For example, the analog front end in the ASIC chip 108 of the light intensity difference sensing device takes the photoelectric signals of the first sensing element 111 and the second sensing element 107 as differential inputs, calculates the light intensity difference, and outputs it to the ADC (analog-to-digital converter) through appropriate filtering and gain to obtain the digital signal of the light intensity difference.

[0038] Of course, the light intensity difference sensor is included, but not limited to, applications in VR glasses; it can also be used in other forms of wearable devices, such as VR headsets, AR glasses, and AR helmets, which offer immersive experiences. Furthermore, the placement and configuration of the light intensity difference sensor within wearable devices are quite flexible, and this application does not impose any limitations on this.

[0039] In some embodiments of this application, a light intensity difference sensing device is provided, which is suitable for wearable devices with immersive experience functions, such as smart glasses or smart helmets. It can adjust the brightness of the display screen inside the wearable device directly according to the ambient light conditions. When the user removes the wearable device, the user's eyes can gradually adapt to the light intensity difference between the inside and outside of the wearable device, which can effectively avoid damage to the user's eyes caused by a sudden increase in light intensity, thereby effectively preventing glare.

[0040] See some examples in this application. Figure 1 and Figure 2 The support structure includes a motherboard 105 and a carrier board 102 disposed on one side of the motherboard 105; a first through hole 104 is provided on the motherboard 105, and a second through hole is provided on the carrier board 102, wherein the second through hole and the first through hole 104 are disposed opposite to each other and form the light transmission channel; the ASIC chip 108 is disposed on the side of the carrier board 102 away from the motherboard 105 and covers the second through hole.

[0041] The motherboard 105 is, for example, a PCB board. The first through hole 104 is an opening on the PCB board.

[0042] The carrier board 102 is used to support the ASIC chip 108.

[0043] For example, the carrier plate 102 can be mounted on the motherboard 105 by soldering.

[0044] Specifically, see Figure 1The carrier board 102 can be mounted on the motherboard 105 via solder pads.

[0045] The first through-hole 104 on the motherboard 105 is connected to the second through-hole on the carrier board 102 to form a light transmission path, which is the light transmission channel on the support structure mentioned in the above embodiment. Taking VR glasses as an example again, see... Figure 1 and Figure 2 The imaging light 02 emitted by the display screen inside the VR glasses can be transmitted to the second sensor 107 through the first through hole 104 and the second through hole. The second sensor 107 can receive the imaging light 02 emitted by the display screen and detect and acquire light intensity information.

[0046] The ASIC chip 108 can be optionally fixedly mounted on the carrier board 102.

[0047] Of course, the ASIC chip 108 can also be detachably mounted on the carrier board 102. This allows the ASIC chip 108 to be replaced and maintained as needed.

[0048] See some examples in this application. Figure 1 and Figure 2 The ASIC chip 108 has a through-silicon via 109 along its thickness direction. The through-silicon via 109 is used to electrically connect the second sensing element 107 to the ASIC chip 108. The second sensing element 107 is located in the second through-hole, and the second through-hole is filled with a light-transmitting material 106, which covers the second sensing element 107.

[0049] According to the above example, the ASIC chip can be electrically connected to the second sensing element 107 through the through silicon via 109. The through silicon via 109 also has the function of heat conduction, which can improve the heat dissipation performance of the light intensity difference sensing device.

[0050] The second through-hole is filled with a light-transmitting material 106. The light-transmitting material 106 can protect the second sensing element 107 without affecting light transmission. The light-transmitting material 106 is, for example, a transparent molding compound.

[0051] See some examples in this application. Figure 1 and Figure 2 A thermally conductive and light-shielding layer 110 is provided between the first sensing element 111 and the ASIC chip 108, and the first sensing element 111 and the ASIC chip 108 are connected by an electrical connection line 101. The thermally conductive and light-shielding layer 110 is made of acrylic material or epoxy resin material.

[0052] The electrical connection line 101 is, for example, a gold wire on the first sensing element 111, which can electrically connect the first sensing element 111 to the ASIC chip 108 via the gold wire.

[0053] The ASIC chip 108 includes, for example, an analog front-end circuit, an analog-to-digital converter, and registers.

[0054] The thermally conductive and light-shielding layer 110 is, for example, a black material layer.

[0055] Specifically, the thermally conductive and light-shielding layer 110 can be an acrylic thermally conductive and conductive film or an epoxy resin thermally conductive and conductive pin.

[0056] The thermally conductive and light-shielding layer 110 isolates external light from internal light in wearable devices such as VR glasses, preventing crosstalk between them. This design improves the accuracy of light intensity difference calculation, thereby enabling more accurate execution of corresponding display brightness adjustment schemes.

[0057] See some examples in this application. Figure 2 An opaque encapsulation layer 112 is provided between the inner wall of the second through hole and the light-transmitting material 106.

[0058] The opaque encapsulation layer 112, for example, is a black plastic encapsulant formed on the inner wall of the second through hole, which can serve to block light. This design can isolate the external light and internal light of wearable devices such as VR glasses to avoid crosstalk between them and affect the detection results.

[0059] See some examples in this application. Figure 1 and Figure 2 The side of the carrier board 102 where the ASIC chip 108 is disposed is covered with a light-transmitting plastic sealant.

[0060] The material of the light-transmitting plastic sealant can be the same as the light-transmitting material 106 filling the second through hole. The light-transmitting plastic sealant can protect the first sensing element 111 without affecting light transmission.

[0061] According to another embodiment of this application, a wearable device is provided, which is an immersive experience device. The wearable device includes, for example, smart glasses or a smart helmet.

[0062] The following describes in detail the wearable device provided in the embodiments of this application, taking VR glasses as an example.

[0063] The wearable device provided according to the embodiments of this application includes a housing, a display screen, and a light intensity difference sensing device as described above, wherein the display screen and the light intensity difference sensing device are disposed inside the housing.

[0064] The light intensity difference sensor can be placed at any position inside the housing of the wearable device as needed, as long as it can acquire the light intensity inside and outside the wearable device. The environment in which the wearable device is located is the environment in which the light intensity difference sensor is located.

[0065] This application does not limit the placement or arrangement of the light intensity difference sensor within the wearable device. The wearable device may be, for example, VR glasses. By incorporating the light intensity difference sensor provided in this embodiment into the VR glasses, the VR glasses can achieve an anti-glare function. This is because the brightness of the display screen inside the VR glasses can be adjusted in real time according to the ambient light level, preventing the user from being unable to adapt to the external ambient light when removing the VR glasses, thus effectively protecting the user's eyes.

[0066] In some examples of this application, a first light guide structure is provided on the housing, which is used to transmit the ambient light 01 of the environment in which the wearable device is located to the first sensing element 111; a second light guide structure is provided inside the housing, which is used to guide and project the imaging light 02 emitted by the display screen to the second sensing element 107; the light intensity difference sensing device is used to input the photoelectric signals of the first sensing element 111 and the second sensing element 107 as differential inputs to the ASIC chip 108 to obtain the light intensity difference value δ.

[0067] Based on the above example, the first light guide structure and the second light guide structure include, for example, light guide pillars or optical fibers. The first and second light guide structures are primarily designed to transmit light from inside and outside the wearable device, such as VR glasses, so that the light intensity difference sensing device can receive light information from inside and outside the VR glasses, thereby accurately obtaining the light intensity difference value. The environment in which the wearable device is located is also the environment in which the light intensity difference sensing device is located.

[0068] The light intensity difference sensing device includes an ASIC chip 108. The analog front end in the ASIC chip 108 can take the photoelectric signals of the first sensing element 111 and the second sensing element 107 as differential inputs, calculate the light intensity difference, and then output the digital signal of the light intensity difference to the ADC (analog-to-digital converter) through appropriate filtering and gain.

[0069] According to one embodiment of this application, a display screen brightness adjustment method is provided, which is applied to the wearable device described above.

[0070] The display screen brightness adjustment method provided in this application embodiment is described in [reference]. Figure 3 The steps include:

[0071] Step 301: Obtain the light intensity difference δ, where the light intensity difference δ is the external light intensity measurement value A. o The difference A between the internal light intensity measurement and the internal light intensity measurement. i ;

[0072] Among them, the external light intensity measurement value A o The ambient light level of the environment in which the electronic device is located, and the internal light intensity measurement value A. i The luminance value of the display screen of the wearable device;

[0073] Step 302: After step 301 above, based on the light intensity difference δ, the luminance L of the display screen is adjusted. i Adjust to ambient light level L i Or the target brightness value.

[0074] The display screen brightness adjustment method provided in the above embodiments of this application is applicable to wearable devices, primarily devices with immersive experience functions, such as VR glasses, VR headsets, AR glasses, and AR headsets. This application uses VR glasses as an example to describe the display screen brightness adjustment method in detail.

[0075] The display screen brightness adjustment method provided in this application, when applied to VR glasses, can accurately obtain the light intensity difference δ between the inside and outside of the VR glasses by real-time monitoring of the light intensity outside and inside the VR glasses. It can then execute different display screen brightness adjustment strategies based on this difference δ. For example, based on the magnitude of the light intensity difference δ, the display screen brightness can be adjusted to the ambient light brightness L. i Alternatively, a target brightness level can be set to protect the user's eyes. For example, the target brightness value is designed to be greater than the ambient light brightness value L. i .

[0076] Specifically, the target brightness value can be the maximum luminous brightness of the display screen, for example, the maximum luminous brightness of the display screen is 500 nit to 1000 nit.

[0077] See Figure 1 The ambient light 01 of the environment in which the VR glasses are located can directly enter the interior of the VR glasses. Alternatively, the ambient light 01 can also enter the interior of the VR glasses through light guide pillars, optical fibers, or other light-guiding structures located on the VR glasses' shell, allowing for real-time acquisition of external light intensity information. The environment in which the VR glasses are located is the environment of the light intensity difference sensing device inside them.

[0078] After obtaining the external light intensity measurement value A of the VR glasseso Compared with the internal light intensity measurement value A i Based on this, the light intensity difference δ between the inside and outside of the VR glasses can be obtained, thereby determining whether the ambient light of the environment in which the VR glasses are located will affect the user's eyes, so as to avoid damage to the user's eyes due to the large light intensity difference between the inside and outside of the VR glasses when the user removes the VR glasses.

[0079] The display screen brightness adjustment method provided in this application embodiment directly uses the light intensity difference δ between the inside and outside of the VR glasses, resulting in a wider dynamic range. Specifically, it uses the light intensity difference δ between the inside and outside of the wearable device, such as VR glasses, as a reference to adjust the display screen's brightness. This allows users to adapt well to ambient light conditions when removing the VR glasses after prolonged wear, thus improving user comfort.

[0080] See some examples in this application. Figure 4 The step of adjusting the luminance of the display screen to the ambient light brightness value or the target brightness value based on the light intensity difference includes the following step 401:

[0081] Step 401: When the light intensity difference δ > 0 and the light intensity difference δ is less than the first threshold S1, increase the luminance L of the display screen. i Adjust to the ambient light brightness value L0.

[0082] See some examples in this application. Figure 4 The step of adjusting the luminance of the display screen to the ambient light brightness value or the target brightness value based on the light intensity difference includes the following step 402:

[0083] Step 402: When the light intensity difference δ > 0 and the first threshold S1 < the light intensity difference δ < the second threshold S2, increase the luminance L of the display screen. i Adjust to the target brightness value; wherein the target brightness value is greater than the ambient light brightness value.

[0084] Based on the two examples above in this application, and according to different light intensity differences δ, different strategies for adjusting the brightness of the display screen inside the wearable device are designed in the embodiments of this application. This can maximize the protection of the user's eye health and improve the anti-glare effect.

[0085] For example, when the light intensity difference δ > 0 and the light intensity difference δ < the first threshold S1, the brightness L of the display screen is controlled to be increased. i Adjust to the ambient light brightness value L o .

[0086] Specifically, the obtained light intensity difference δ between the inside and outside of the wearable device is compared with a pre-set first threshold S1. When the conditions are met: the light intensity difference δ > 0 and the light intensity difference δ < the first threshold S1, it indicates that there is a light intensity difference δ between the inside and outside of the wearable device, and the ambient light brightness L outside the wearable device is... o The luminance L of the display screen inside itself is greater than that of the display screen itself. i However, the light intensity difference δ between the inside and outside of the wearable device is not currently large, as it is less than the preset first threshold S1. At this point, it is only necessary to increase the display's luminance L... i Adjust to the ambient light brightness value L o This reduces the difference in light intensity δ between the inside and outside of the wearable device to zero. At this point, the light intensity inside and outside the wearable device is consistent, allowing the human eye to adapt to the ambient light intensity within the wearable device over a certain period. Through this level of display brightness adjustment strategy, users will not experience a noticeable difference in light intensity when removing the wearable device, even when the difference in light intensity between the inside and outside is minimal. This effectively prevents glare and protects the user's eyes.

[0087] For another example mentioned above, the brightness adjustment strategy for the display screen is as follows: when the light intensity difference δ > 0 and the first threshold S1 < the light intensity difference δ < the second threshold S2, the luminous brightness L of the display screen is adjusted. i Adjust to the target brightness value. In this level of display brightness adjustment strategy, the difference in light intensity between the inside and outside of the wearable device is larger than in the previous example. Therefore, the display's luminous brightness L can be controlled to... i Adjust it to a higher level; for example, the screen's brightness can be adjusted to a target brightness value, which should be greater than the ambient light brightness value L. i .

[0088] The target brightness value can be determined based on the ambient light brightness L0 outside the wearable device and the luminous brightness L of the internal display screen itself. i Configure the settings.

[0089] For example, when the maximum brightness value of the display screen is greater than the ambient light brightness value L i At that time, the luminance L of the display screen can be increased. i Adjust to the highest brightness that it can achieve (L) imax The maximum brightness of the display screen (L) imax For example, 500 nit to 1000 nit.

[0090] Specifically, when the light intensity difference δ is greater than 0 and greater than the first threshold, the ambient light brightness L0 outside the wearable device is large. To precisely control the display brightness adjustment method, the light intensity difference δ is further compared with a preset second threshold S2, where the second threshold S2 is greater than the first threshold S1. When the condition is met that the light intensity difference δ > 0 and the first threshold S1 < the light intensity difference δ < the second threshold S2, the luminous brightness L0 of the display is controlled to be adjusted. i The ambient light intensity L0 outside the wearable device is adjusted to a value greater than the target brightness value. This reduces the difference in light intensity δ between the inside and outside of the wearable device to almost zero. At this point, the light intensity inside and outside the wearable device is consistent, allowing the human eye to pre-adapt to the external light intensity within the wearable device. This avoids eye discomfort after directly removing the glasses.

[0091] Because the solution of this application can adaptively adjust the brightness of the display screen inside the wearable device according to different ambient brightness, so that the user can better adapt to the external ambient light after removing the wearable device, the solution provided by the embodiments of this application is applicable to various ambient brightness scenarios, improves the flexibility of adjusting the brightness of the display screen inside the wearable device, and realizes effective adjustment of the display screen brightness under various ambient light conditions such as extremely bright, high brightness and extremely dark, so that the human eye can adapt to the external ambient light.

[0092] See Figure 5 The process of changing from point c0 to point c1 on line segment C is: δ(c0) - δ(c1) = δadjust - p, which is the limit of positively adjustable brightness change of the display screen; δ(c1) ≤ 0, indicating that the luminous brightness L of the display screen in the wearable device can be adjusted. i Set to the target brightness value, which can be the display's maximum brightness (L). imax For example, 500 nit to 1000 nit can reduce the difference in light intensity δ between the inside and outside of the wearable device to 0. At this time, the light intensity inside and outside the wearable device is the same, and the human eye can pre-adapt to the external light intensity inside the wearable device.

[0093] It should be noted that the difference in light intensity δ between the inside and outside of the wearable device is related to the luminance L of the internal display screen. i It exhibits an approximately linear relationship. Different products can have their display screen's brightness L adjusted by fixing the external light intensity at the factory. i The coefficients are calibrated by measuring the light intensity difference δ.

[0094] In the embodiments of this application, a display screen brightness adjustment method is provided, which is applicable to wearable devices such as VR glasses. It can adjust the brightness of the display screen inside the wearable device according to the ambient light conditions, so that the user's eyes can adapt to the ambient light outside the wearable device before the user's eyes are exposed to the ambient light outside the wearable device. This avoids significant discomfort to the eyes when the glasses are removed, thereby protecting the user's eyes and improving the user experience.

[0095] In some examples of this application, adjusting the luminance of the display screen to an ambient light brightness value or a target brightness value based on the light intensity difference includes:

[0096] Within the target time period, the brightness of the display screen is adjusted to the ambient light brightness value or the target brightness value.

[0097] When a user wears wearable devices such as VR glasses for an extended period, before removing the VR glasses, the brightness L of the display screen inside the VR glasses can be adjusted based on the light intensity difference δ between the inside and outside of the VR glasses, according to different light intensity differences δ. i This allows for the execution of corresponding levels of display brightness adjustment, enabling users to better adapt to ambient light after removing their VR glasses. Executing the display brightness adjustment requires a certain amount of time, referred to as the aforementioned target time, which is, for example, set to within 1 minute.

[0098] The target time can also be called the light adaptation time. The light adaptation time defined here is the time it takes for the user's eyes to adapt to the light inside the wearable device before the user removes it. After this time, the user can adapt to the ambient light outside the device after removing it.

[0099] For example, the brightness L of the VR glasses' display screen before the user removes the glasses. i The light intensity can be increased at a constant rate within 1 minute until the light intensity difference δ = 0. This rate can be determined by the duration of light adaptation time and the light intensity difference δ at the moment of lens removal. off The decision was made. The adaptation time allows users to adjust to the ambient light conditions outside the VR headset before removing it.

[0100] See some examples in this application. Figure 4 The step of adjusting the luminance of the display screen to the ambient light brightness value or the target brightness value based on the light intensity difference includes the following step 403:

[0101] Step 403: When the light intensity difference is greater than 0 and the light intensity difference is greater than the second threshold, adjust the brightness of the display screen to the target brightness value, continue for a first duration, and control the wearable device to be in a locked state.

[0102] If the wearable device is detected to have been removed at least twice, the wearable device is unlocked and a prompt message is output, which indicates that the light intensity difference between the inside and outside of the wearable device is large; wherein, the second threshold is greater than the first threshold.

[0103] The notification information includes at least one of vibration alerts, voice alerts, and display screen alerts.

[0104] Based on the above example, when the light intensity difference δ > 0 and the light intensity difference δ > the second threshold S2, it indicates that the ambient light outside the wearable device is extremely bright, possibly in an environment with extremely strong light, such as under the blazing sun. In this case, the light intensity difference between the inside and outside of the wearable device is extremely large. That is to say, step 403 above can be applied to scenarios where the difference between the ambient light brightness and the luminous brightness of the display screen is extremely large, especially scenarios where the ambient light brightness itself is extremely large.

[0105] When there is a significant difference in light intensity between the inside and outside of the wearable device, the display screen can be adjusted to a target brightness value, which is greater than the ambient light brightness value L, before the wearable device is removed. i For example, if the target is the highest brightness value of the display screen, there may still be a certain degree of light intensity difference between the inside and outside of the wearable device. This can be divided into two situations: one is a small light intensity difference, and the other is a large light intensity difference. A scenario with a small light intensity difference is, for example, a bright indoor environment during the day. A scenario with a large light intensity difference is, for example, a strong outdoor sunlight environment.

[0106] If the difference in light intensity is small, the human eye can adapt to changes in light intensity. (See also: [link to related documentation]). Figure 5 The process of changing the value of point b0 to point b1 corresponding to line segment B is: δ(b0)-δ(b1)=δadjust-p, which is the limit of positive adjustable brightness change of the display screen. δ(b1)≤δ(safe) indicates that when the brightness of the display screen is adjusted to the highest brightness value, such as 500 nits, there is still a light intensity difference between the inside and outside of the wearable device, but the light intensity difference is very small.

[0107] However, even if the brightness of the display screen inside the wearable device is adjusted to its maximum value, such as 500 nits, the difference in light intensity between the inside and outside of the wearable device is still significant, exceeding the second threshold mentioned above. In this case, additional conditions can be added to permit the removal of the wearable device, such as VR glasses, as follows:

[0108] See Figure 5The process of changing the value from point a0 to point a1 corresponding to line segment A is: δ(a0) - δ(a1) = δadjust - p, which represents the limit of positively adjustable brightness change of the display screen. δ(a1) > δ(safe), indicating that even when the display screen is set to its highest brightness value, such as 500 nits, there is still a significant difference in light intensity between the inside and outside of the VR glasses. For example, a safety lock can be used within the VR glasses to temporarily lock the VR glasses in place around the user's eyes. After the safety lock is unlocked, the user can remove the glasses.

[0109] Specifically, when the ambient light brightness value L0 is extremely high during VR glasses use, a corresponding display brightness adjustment strategy can be activated to allow the user to adapt to the ambient light in advance within the VR glasses. Since the ambient light brightness value L0 is very high, in order to prevent the user from directly removing the glasses, while executing the display brightness adjustment strategy, a safety lock can be used to temporarily lock the VR glasses to the user's eyes. If the wearable device is detected to have been removed at least twice, the lock on the wearable device will be released and a prompt message will be output.

[0110] The safety lock's opening and releasing mechanism is designed such that when the light intensity difference δ between the inside and outside of the wearable device, such as VR glasses, exceeds the second threshold S2, the safety lock is activated. After the display brightness adjustment is completed and the human eye has adapted to the external ambient light inside the VR glasses, the safety lock can be released, at which point the user can freely remove the VR glasses. In this application, the design could prevent the user from removing the glasses when the safety lock is activated.

[0111] The security lock can be implemented, for example, by mechanical or electronic means.

[0112] In this application, the user-controlled process of removing the wearable device is designed, for example, as follows:

[0113] When a user touches the removal switch, which can be implemented using sensors such as, but not limited to, optical, capacitive, pressure-sensitive, and accelerometer sensors, the wearable device detects the user's removal action, activates the safety lock, and outputs a prompt message, such as a vibration, voice, or screen warning. At this point, the user cannot remove the wearable device. Simultaneously, a corresponding display brightness adjustment strategy can be implemented.

[0114] To handle special circumstances, wearable devices can be equipped with a forced-on switch, which can be triggered in special scenarios to directly remove the wearable device.

[0115] In typical scenarios, when a user is detected removing the device, the wearable device can provide information based on the difference in light intensity between the inside and outside, and execute different display brightness adjustment strategies.

[0116] According to statistics on human vision, the light adaptation process generally takes less than 1 minute, and users can set the duration of the light adaptation time themselves. For example, the first duration can be controlled within 1 minute.

[0117] Furthermore, an anti-reflective coating can be applied to the display screen to increase the brightness inside wearable devices such as VR glasses, thereby minimizing the difference in light intensity between the inside and outside of the VR glasses. This allows the user's eyes to adapt to ambient light after removing the glasses. The anti-reflective coating is sized to cover the user's eyes. For example, the anti-reflective coating can be attached to the display screen in a pop-out manner when needed; that is, the anti-reflective coating is for single use and can be removed after use.

[0118] See some examples in this application. Figure 4 The step of adjusting the luminance of the display screen to the ambient light brightness value or the target brightness value based on the light intensity difference includes the following step 404:

[0119] Step 404: When the light intensity difference is <0 and the light intensity difference is <the third threshold, adjust the brightness of the display screen to the ambient light brightness value and continue for a second duration.

[0120] When the ambient light level outside the wearable device is L o Lower, and lower than the luminance L of the display inside the wearable device. i At this time, the brightness of the display screen can be appropriately reduced. i This is to ensure that the external light intensity of the wearable device is equal to the internal light intensity.

[0121] For example, the scenario in step 404 above is a dimly lit indoor environment or a cloudy outdoor environment with low brightness.

[0122] Specifically, during the second duration, the luminance L of the display screen is increased. i The light intensity is reduced to the same level as the ambient light level L0 outside the wearable device, allowing the human eye to adapt to the external light intensity within the wearable device. The second duration is designed, for example, to be within 1 minute.

[0123] See Figure 5 The process of changing the value of point d0 to point d1 corresponding to line segment D is: δ(d1) - δ(d0) = δadjust - n, which is the limit of the negative adjustable brightness change of the display screen. In this scenario, when the user removes the wearable device, the external light intensity of the wearable device is lower than its internal light intensity. Theoretically, D intersects with the horizontal axis, so the brightness of the display screen can be adjusted to make the external light intensity of the wearable device equal to its internal light intensity.

[0124] Optionally, when the ambient light brightness value L oWhen the value is below the fourth threshold S4, the display screen is switched to an off state.

[0125] When the ambient light brightness value L o When the value is below the fourth threshold S4, it indicates that the external environment in which the wearable device is located is dark or relatively dim. A specific application scenario is when a user uses the wearable device indoors at night without lights or outdoors in dim light. In this case, the display screen inside the wearable device can be turned off for a certain period of time, for example, within 1 minute. Before removing the wearable device, the user's eyes can adjust to the darker environment inside the device.

[0126] The display brightness adjustment method provided in this application embodiment can be applied to wearable devices such as VR glasses. When a user uses VR glasses for a long time and the brightness of the light inside the VR glasses differs greatly from the brightness of the external ambient light, the brightness inside the VR glasses can be adjusted in stages according to the light intensity difference. This allows the user to have a period of light adaptation time before removing the glasses, enabling the user to adapt to the external light intensity inside the VR glasses and thus protecting the user's eyes.

[0127] The display brightness adjustment method provided in this application embodiment can trigger different display brightness adjustment schemes based on the different light intensity differences between the inside and outside of the wearable device.

[0128] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0129] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A light intensity difference sensing device, characterized in that, The light intensity difference sensing device includes: A support structure, wherein a light transmission channel is provided on the support structure; An ASIC chip, wherein the ASIC chip is disposed on the support structure; A first sensing element and a second sensing element are respectively disposed on opposite sides of the ASIC chip, and the second sensing element is located within the light transmission channel; Wherein, the first sensing element is used to receive the ambient light of the environment in which the light intensity difference sensing device is located and generate a first photoelectric signal to obtain an external light intensity measurement value; the second sensing element is used to receive the imaging light emitted by the display screen and generate a second photoelectric signal to obtain an internal light intensity measurement value; the ASIC chip is used to obtain a light intensity difference value based on the difference between the external light intensity measurement value and the internal light intensity measurement value. A thermally conductive and light-blocking layer is provided between the first sensing element and the ASIC chip, and the first sensing element and the ASIC chip are connected by an electrical connection line.

2. The light intensity difference sensing device according to claim 1, characterized in that, The support structure includes a motherboard and a carrier board disposed on one side of the motherboard; The motherboard has a first through hole, and the carrier board has a second through hole, which is positioned opposite to the first through hole to form the light transmission channel; the ASIC chip is disposed on the side of the carrier board away from the motherboard and covers the second through hole.

3. The light intensity difference sensing device according to claim 2, characterized in that, The ASIC chip has through-silicon vias along its thickness direction, and the through-silicon vias are used to electrically connect the second sensing element to the ASIC chip. The second sensing element is located inside the second through hole, and the second through hole is filled with a light-transmitting material, which covers the second sensing element.

4. The light intensity difference sensing device according to claim 1, characterized in that, The thermally conductive and light-shielding layer is made of acrylic or epoxy resin.

5. The light intensity difference sensing device according to claim 3, characterized in that, An opaque encapsulation layer is provided between the inner wall of the second through hole and the light-transmitting material.

6. The light intensity difference sensing device according to claim 2, characterized in that, The side of the carrier board where the ASIC chip is located is covered with a light-transmitting plastic sealant.

7. A wearable device, characterized in that, It includes: a housing, a display screen, and a light intensity difference sensing device as described in any one of claims 1-6, wherein the display screen and the light intensity difference sensing device are disposed within the housing.

8. The wearable device according to claim 7, characterized in that, The housing is provided with a first light guide structure, which is used to transmit the ambient light of the environment in which the wearable device is located to the first sensing element. The housing is provided with a second light guide structure, which is used to guide the imaging light emitted by the display screen and project it onto the second sensing element; The light intensity difference sensing device is used to input the photoelectric signals of the first sensing element and the second sensing element as differential inputs into the ASIC chip to obtain the light intensity difference value.

9. A method for adjusting the brightness of a display screen, characterized in that, Applied to the wearable device as described in claim 7 or 8, the method includes: The light intensity difference is obtained, which is the difference between the external light intensity measurement value and the internal light intensity measurement value; wherein, the external light intensity measurement value is the ambient light brightness value of the environment in which the wearable device is located, and the internal light intensity measurement value is the luminous brightness value of the display screen of the wearable device; Based on the light intensity difference, the brightness of the display screen is adjusted to the ambient light brightness value or the target brightness value.

10. The display screen brightness adjustment method according to claim 9, characterized in that, The step of adjusting the luminance of the display screen to the ambient light brightness value or the target brightness value based on the light intensity difference includes: When the light intensity difference is greater than 0 and less than a first threshold, the luminance of the display screen is adjusted to the ambient light brightness value.

11. The display screen brightness adjustment method according to claim 9, characterized in that, The step of adjusting the luminance of the display screen to the ambient light brightness value or the target brightness value based on the light intensity difference includes: When the light intensity difference is greater than 0 and the first threshold is less than the light intensity difference and the second threshold, the luminous brightness of the display screen is adjusted to the target brightness value. Wherein, the target brightness value is greater than the ambient light brightness value.

12. The display screen brightness adjustment method according to claim 9, characterized in that, The step of adjusting the luminance of the display screen to the ambient light brightness value or the target brightness value based on the light intensity difference includes: Within the target time period, the brightness of the display screen is adjusted to the ambient light brightness value or the target brightness value.

13. The display screen brightness adjustment method according to claim 9, characterized in that, The step of adjusting the luminance of the display screen to the ambient light brightness value or the target brightness value based on the light intensity difference includes: When the light intensity difference is greater than 0 and the light intensity difference is greater than the second threshold, the brightness of the display screen is adjusted to the target brightness value for a first duration, and the wearable device is controlled to be in a locked state. If the wearable device is detected to have been removed at least twice, the lock on the wearable device is released and a prompt message is output, which indicates that there is a large difference in light intensity between the inside and outside of the wearable device. The second threshold is greater than the first threshold.

14. The display screen brightness adjustment method according to claim 9, characterized in that, The step of adjusting the luminance of the display screen to the ambient light brightness value or the target brightness value based on the light intensity difference includes: When the light intensity difference is less than 0 and the light intensity difference is less than a third threshold, the brightness of the display screen is adjusted to the ambient light brightness value and maintained for a second duration.

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